United Airlines CEO Oscar Munoz apologized for the forcible removal of a paying passenger from one of its flights and called the episode “truly horrific.”

Munoz pledged a full review by April 30 “to fix what’s broken so this never happens again.”

“I want you to know that we take full responsibility and we will work to make it right,” Munoz said in a statement on Tuesday. “I promise you we will do better.”

It was his third attempt to quell growing outrage after a passenger was removed, bloodied and screaming, from a flight that was to take off from Chicago for Louisville, Kentucky, on Sunday night. United (UAL) wanted to give seats to commuting crew members.